# United States tariff line 3818.00.00.45: Pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter

> In the United States tariff, line 3818.00.00.45 covers monocrystalline silicon wafers, doped, pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter. Goods under this line enter free of general (MFN) duty. It falls under HS subheading 3818.00 in heading 38.18 (chapter 38).

Source: https://border.bot/countries/united-states/hs-codes/3818000045
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 38](https://border.bot/countries/united-states/hs-codes/38) / [3818.00](https://border.bot/countries/united-states/hs-codes/381800) / [3818.00.00.45](https://border.bot/countries/united-states/hs-codes/3818000045)

## Key facts

- Tariff line: 3818.00.00.45
- Covers: Monocrystalline silicon wafers, doped, pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter
- Duty (MFN): Free
- Additional duties: None recorded
- Restrictions: None recorded
- Tariff: [United States](https://border.bot/countries/united-states)
- HS subheading: [3818.00](https://border.bot/hs-codes/381800)

## What this line covers

In the United States tariff, line 3818.00.00.45 covers monocrystalline silicon wafers, doped, pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter.

Its legal text is “Pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter”, read under “Monocrystalline silicon wafers, doped”.

## How it is structured

It falls under HS subheading 3818.00 in heading 38.18 (chapter 38). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff.

- Chapter 38: Miscellaneous chemical products
- Heading 38.18: Chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics
- Subheading 3818.00: Monocrystalline silicon wafers, doped
- Line 3818.00.00.45: Pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter

## Duty

Goods under this line enter free of general (MFN) duty.

The rate is published on 3818.00.00.

## In other countries

No other national tariff on border.bot has live lines under 3818.00 yet.

- [The Harmonized System text for 3818.00](https://border.bot/hs-codes/381800)

## Other lines under 3818.00

- [3818.00.00.10](https://border.bot/countries/united-states/hs-codes/3818000010) Gallium arsenide wafers, doped
- [3818.00.00.20](https://border.bot/countries/united-states/hs-codes/3818000020) Polycrystalline silicon wafers, doped
- [3818.00.00.30](https://border.bot/countries/united-states/hs-codes/3818000030) Silicon carbide wafers, doped
- [3818.00.00.40](https://border.bot/countries/united-states/hs-codes/3818000040) Round (circular) shaped, as described in statistical note 2 to this chapter
- [3818.00.00.50](https://border.bot/countries/united-states/hs-codes/3818000050) Other
- [3818.00.00.91](https://border.bot/countries/united-states/hs-codes/3818000091) Other

- Previous line: [3818.00.00.40](https://border.bot/countries/united-states/hs-codes/3818000040) Round (circular) shaped, as described in statistical note 2 to this chapter
- Next line: [3818.00.00.50](https://border.bot/countries/united-states/hs-codes/3818000050) Other

## Frequently asked questions

### What does tariff line 3818.00.00.45 cover in the United States tariff?

In the United States tariff, line 3818.00.00.45 covers monocrystalline silicon wafers, doped, pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter.

### What is the general (MFN) duty on 3818.00.00.45 in the United States?

Goods under this line enter free of general (MFN) duty. The rate is published on 3818.00.00.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/3818000045.json